Update app.py

with gr.Row(equal_height=False):

app.py

@@ -27,7 +27,7 @@ Demo for <a href='https://github.com/MarcoForte/FBA_Matting'>FBA Matting</a>
 with gr.Blocks(title="FBA Matting") as app:
     gr.HTML("<center><h1>FBA Matting</h1></center>")
     gr.HTML("<center><h3>Foreground, Background, Alpha Matting Generator.</h3></center>")
-    with gr.Row().style(equal_height=False):
+    with gr.Row(equal_height=False):
         with gr.Column():
             input_img = gr.Image(type="filepath", label="Input image")
             input_trimap = gr.Image(type="filepath", label="Trimap image")